SUMMARY
Indonesia, Malaysia and Singapore are in an area, namely ASEAN and have territorial waters that are between the three countries, known as the waters of the Malacca Strait. Meanwhile, the waters of the Malacca Strait are the densest waters in the world, where approximately 50,000 cargo ships cross the Malacca Strait every year. Therefore it is interesting to study how the state's responsibility for the waters of the Malacca Strait in relation to the prevention of transnational crime. The results of the study show that transnational crimes that occur in border areas, it is clear that crimes that occur in these areas will lead to state responsibility (ie coastal countries). This is in accordance with the 1982 United Nations Convention on the Law of the Sea (UNCLOS), which stipulates that maritime security is the responsibility of the coastal state that owns the area. Thus Indonesia, Malaysia and Singapore are countries that are equally responsible for transnational crimes that occurred in the waters of the Malacca Strait.